Stishovite
SiO2
third-order Birch-Murnaghan · Original · 2024
V₀
—
Unknown basis
K₀
306.600
GPa
Adiabatic
K′
4.920
dimensionless
Volume (V₀)
| Value | Unit | Basis | Z |
|---|---|---|---|
| — | — | Unknown basis | — |
Reported value and unit are preserved as extracted. Z (formula units per cell) is not stored yet, so molar ↔ ų/f.u. conversion is not applied automatically.
Composition
| Oxide | Molar |
|---|---|
| SiO2 | 1 |
Formula: SiO2
Conditions & method
- Tref
- —
- Pref
- —
- Structure
- other / unspecified
- Method
- experiment (Brillouin / ultrasonic / elasticity)ultrasonic interferometry with in situ synchrotron X-ray diffraction and X-radiographic imaging (multi-anvil)
- Sample
- polycrystalline stishovite hot-pressed from fused SiO2 (>99.9% purity), grain size <1 um
Source
- Paper
- Sound Velocities of Stishovite at Simultaneous High Pressure and High Temperatu…
- Authors
- Sibo Chen; Siheng Wang; Xintong Qi; Man Xu; Tony Yu; Yanbin Wang; Baosheng Li
- DOI
- 10.1029/2023gl107700
- Year
- 2024
- Journal
- Geophysical Research Letters
- Origin
- Original (measured or fitted in the source paper)
Evidence from the paper
By fitting velocities to the finite strain equations, the elastic moduli and density were determined to be K_S0 = 306.6(46) GPa, K_S' = 4.92(10), dKS/dT = -0.024(1) GPa/K, G0 = 229.0(34) GPa, G' = 1.07(10), dG/dT = -0.017(1) GPa/K, rho0 = 4.287(2) g/cm3.
Additional notes
dKS dT
-0.024(1) GPa/K
G0
229.0(34) GPa
G prime
1.07(10)
dG dT
-0.017(1) GPa/K
rho0
4.287(2) g/cm3 (from energy-dispersive X-ray diffraction)
P max
14.5 GPa
T max
800 degC
thermal expansion used
alpha_a = 1.26e-5 K^-1, alpha_b = 1.29e-8 K^-2 (Nishihara et al., 2005)
Gruneisen parameter used
gamma = 1.34 (Stixrude & Lithgow-Bertelloni, 2005)